U.S. Air Force captain and non-commissioned officers examine Agena vehicle on transport cradle in a building at Vandenberg AFB

'Discoverer Satellite' explains use of satellite for defense intelligence in the United States. Shows function of Agena vehicle in the Discoverer program to develop and practice orbital space maneuver, at Vandenberg AFB, California. Artistic rendering of Agena vehicle as it travels through star-studded sky. U.S. Air Force captain stands beneath dish-shaped tracking antenna. The Captain speaks. Captain in missile assembly building holds briefing sessions for non-commissioned officers. He uses globe and model Agena to illustrate orbital path. Captain and non-commissioned officers examine Agena vehicle on transport cradle in a building. Captain stands in front of a sketch of Agena vehicle receiving infra-red signals detected from enemy rocket or missile launches, and transmitting radar signals to stations in the United States.